Ani Ma'amin (Hebrew, "I believe"), is a short Jewish
creed of unknown authorship, which is based on Maimonides'
principles of faith and dates back to the 15th century. In most Ashkenazi
prayer books, it is printed at
the end of the Morning Service. More particularly it is the title of Elie
Wiesel's cantata, as song related to the Holocaust. A.G.H.

Source:

Bowker, John, The Oxford Dictionary of World Religions,
New York, Oxford University Press, 1997, p. 71